Arrangement for traversing a yarn in two directions

ABSTRACT

In a textile machine, two traverse (crosswise) movements of the yarn in mutually perpendicular planes are obtained by means of a single oscillating yarn guide and a deflector pin guiding the yarn from one plane to the other and forming an angle with both of the traverse directions.

United States Patent Regelmann et al.

[ 51 Mar. 28, 1972 [54] ARRANGEMENT FOR TRAVERSING A YARN IN TWO DIRECTIONS [72] Inventors: Roll F. Regelmann, Buchenbronn; Wolfgang Rlek, Eislingen, Fils both of Germany Zlnser-Textllmaschlnen Gesellschalt mlt Beschrankter l-laitung, Ebersbach. Germany [22] Filed: Sept.11, 1970 [2]] Appl. No.: 71,293

[73] Assignee:

[30] Foreign Application Priority Data Sept. 19, 1969 Germany ..P 19 47 452.3

[52] U.S. Cl. ..57/55.5, 18/1 R, 28/62,

28/71.3, 57/157 S [51] Int. Cl ..D02j 1/22, D02j 13/06 [58] FieldoiSearch ..57/l57-l59,55.5, 57/34 1-18, 157 TS, 90; 28/62, 71.3; 18/1 R; 264/290 [56] References Cited UNITED STATES PATENTS Heighten ...28/7l.3 X Marlborough et ul. ..28/62 X Primary Examiner-John Petrakcs At1orneyEdwin E. Greigg [57] ABSTRACT In a textile machine, two traverse (crosswise) movements of the yarn in mutually perpendicular planes are obtained by means of a single oscillating yarn guide and a deflector pin guiding the yarn from one plane to the other and forming an angle with both of the traverse directions.

7 Claims, 5 Drawing Figures Patented March 28, 1972 2 Sheets-Sheet l Patented March 28, 1972 3,651,631

2 Sheets-Sheet 2 ARRANGEMENT FOR TRAVERSING A YARN IN TWO DIRECTIONS FIELD OF THE INVENTION The invention relates to the traversing of yarn in a textile machine.

BACKGROUND OF THE INVENTION It is previously known to traverse yarn along the surface of a first guide element for inserting the same in an operating field of a textile machine and also along the surface of a second guide element which is disposed subsequent to the first one in the direction of travel of the yarn, the traverses of the yarn on the first and second guide elements being substantially perpendicular to each other.

The term traverse" is used in the context of the present invention to designate movement of a longitudinally traveling yarn perpendicularly to the longitudinal direction.

The term yarn" is used generically to designate any elongated textile formation, such as yarn, twine, thread, endless yarn (yarn consisting of one or more filaments), or the like.

The traversing of a running yarn corresponds to a slow crosswise movement to-and-fro thereof and serves to prevent the yarn from being caught in mechanical members over which it is guided or which are used to transport the same.

In textile machinery, it is often the case that the yarn runs through an operating field where it has to perform mutually perpendicular subsequent traverses. To this end, there has usually been provided for each traverse motion a corresponding oscillating yarn guide. This is a substantial complication with regard to the construction of the yarn guides and the means for driving the same. Also, the servicing and cleaning time is increased correspondingly.

SUMMARY OF THE INVENTION In accordance with the invention, there is provided a single oscillating yarn guide for creating mutually perpendicular traverses of the yarn. The yarn guide primarily creates a traverse motion along the first guide element. Provided between the first and the second guide elements is a deflector element having an elongated yarn-guiding surface inclined relative to the surfaces of the first and the second guide elements so as to cause the yarn consequent to the traverse motion thereof along the surface of the first guide element to be traversed, first, on the deflector member, thereby causing a second traverse on the second guide element.

The first guide element may be of an arbitrary conventional type used in textile machinery, such as a roller for transferring the yarn to the operating field, one ofa pair of rollers, a galette or godet, or a yarn-laying roller or some other plane or curved, fixed or movable surface or edge, along which the yarn is traversed by an oscillating yarn guide. The second guide element may also be of any suitable, conventional or known form used in textile machinery, the surface on which the yarn traverses being either movable or fixed and either plane or curved. For instance, the second guide element may be a takeup roller, a galette or godet, a guide roller, a guide rail, or the like. In a preferred embodiment, the second guide element may be one for treating the yarn, such as a heating device having a heated surface on which the yarn slides or the like.

The deflector element can have any of a number of suitable forms. Preferably, it may be in the form of a pin, a ruler, a rod, or the like. A particularly simple and inexpensive construction is obtained if the yarn-guiding surface thereof is stationary and the yarn slides thereon. If the sliding friction of the yarn on the deflector element should be disturbing, the element may also be a roller or the like having a yarn guiding surface thereon.

Generally, it is of particular advantage if the longitudinal extension of the yarn-guiding surface is inclined at an angle of from 30 to 60, preferably about 45, relative to a line on the surface of the first guide element which is parallel to the traverse movement of the yarn on the first guide element.

Preferably, the inclination of the deflector element relative to the surfaces of the guide elements is adjustable.

Further features and advantages of the invention will become apparent from a study of the following description with reference to the drawing and claims thereof, it being understood that other embodiments are possible within the scope of the claims.

BRIEF DESCRIPTION OF THE DRAWING FIG. 1 is a lateral elevation of a stretch field of a draw twister having a traverse arrangement according to the invention.

FIG. 2 is a front view of the embodiment of FIG. 1.

FIG. 3 is a partial plan view of the embodiment of FIGS. I and 2.

FIG. 4 shows a modified form of a deflector element according to the invention.

FIG. 5 is a modified form of the FIG. 3 embodiment.

DESCRIPTION OF EMBODIMENTS The invention is illustrated in the drawing in the application to a draw twister but is not limited to such machines. It will be obvious from the disclosure that it is applicable to any kind of textile machine in which it is desired to provide a traverse movement of a yarn in a direction substantially perpendicular thereto.

Like elements are designated alike throughout the various figures.

In FIGS. 1 and 2, there are shown the parts of a draw twister which are necessary for understanding the operation of the stretch field shown. It is obvious that the machine may comprise any number of such stretch fields.

In FIGS. 1, 2 and 3, there is shown a stretch unit for stretching an endless yarn and comprising at the input end a first guide element in the form of a lower roller 7 driven by a motor (not shown). Held in pressure engagement with roller 7 by means ofsprings or the like (not shown) is an upper roller 5 mounted rotatably on an arm 20, arm 20 being angularly adjustable on a stationary shaft 21. The yarn 1 may be pulled off from a storage reel or the like (not shown). Since draw twisters serve to stretch endless synthetic threads, yarn I in its movement through the stretch field 22, in order to provide positive transportation thereof, is disposed in a plurality of turns about upper roller 5 as well as around a rotatably mounted yarn guide 3 having guide notches therein. Upper roller 5 is driven by friction from lower roller 7. After leaving upper roller 5, the yarn still partially engages the circumference of under roller 7, as shown in FIG. 1, whereby roller 7 serves according to the invention as a first guide element for introducing the yarn in the stretch field shown. From roller 7, the yarn runs over a deflector element 16 and a second guide element in the form of a heating plate 9, on the heating surface 23 of which it is slidable, to a driven galette or godet 11 with distributor roller 12, both of which carry a plurality of turns to provide reliable transportation. Galette or godet 11 has a higher peripheral velocity than roller 7, and the yarn is transported by these elements without slipping through the stretch field 22 subject to the heat from heating plate 9, and is thus stretched to a greater length. From galette 1 l the yarn is transferred to a winding device of conventional type such as a sleeve mounted on a spindle for winding up the yarn by means of a ring and a traveller or the like.

Yarn guide 3 is mounted on an arm 24 attached to a rail 14. Rail I4 is reciprocated slowly in the direction of the dual arrow A by means of a conventional traverse driving device, not shown, and thus performs an oscillating movement, corresponding to which notched yarn guide 3 is also oscillated. This causes the turns of the yarn which are in contact with guide 3 and upper roller 5 to continuously move to and fro axially relative to rollers 5 and 7 in the direction of arrow A. In this manner, the yarn is traversed at the point of entry into the stretch field. This prevents the yarn from being caught in the upper roller 5, which is provided with an elastic bellows. Since the yarn slides on heating surface 23 of plate 9, there is at this point a particularly great danger of the yarn cutting grooves in the heating surface. To prevent this, it is necessary to continu ously traverse the yarn also on heating surface 23. Heating plate 9 forms a second guide element in accordance with the invention, the surface 23 of which is perpendicular to the axis 26 of roller 7, so that the traverse movement on it by the yarn is required to be perpendicular to the one on roller 7. A simple means for traversing the yarn on surface 23 without the use of a second oscillating yarn guide is provided according to the invention between roller 7 and plate 9 in the form of a deflector element 16. In the embodiment shown, element 16 is a round pin over which the yarn is slidably moved.

Pin 16 is affixed to an angle piece 17, which is detachably and adjustably mounted on a fixed rail 19 extending along the machine and secured in position by a fastening screw 18.

By turning of angle piece 17 about screw 18, it is possible to adjust the inclination of axis 27 of pin 16 relative to axis 26 of roller 7 and to surface 23. The axes 26 and 27 in the preferred embodiment shown are in parallel planes which are perpendicular to the planes of FIGS. 1 and 2. The angle a between these axes may have a value between 30 and 60, a particularly advantageous value being about 45.

The primary traverse of the yarn on roller 7 in the direction A causes a traversing thereof on deflector element 16 and this traverse in its turn causes a traverse on surface 23 in the direction B.

As is especially clear from FIG. 3, which shows a fractional plan view of roller 7 with roller removed and of deflector element 16 and plate 9 also shown in plan view, the amplitude a'b of the traverse on the heating surface is dependent on the amplitude 11-12 of the traverse on roller 7 and the angle of inclination a. The larger is a, the larger will be a'b' for a given value ofa-b.

The position of axis 27 is chosen so that, with reference to the plan view of FIG. 3, the lines 28, 29 defined by the directions A, B and axis 27 diverge as shown.

The operation ofthe FIG. 3 embodiment is as follows:

In the position a of the yarn corresponding to the right-hand point of traverse reversal on roller 7 closest to the heating surface, the yarn runs without substantial influence from deflector element 16 in an approximately straight line from roller 7 to plate 9. In the extreme left-hand reversal position b on roller 7, the yarn runs along the dash-dot line 30 from roller 7 to plate 9.

If, as shown in FIGS. 1, 2 and 3, the yarn guiding surface of element 9 is rectilinear in the longitudinal direction, the velocity of the primary traverse A on roller 7 is transformed into a proportional velocity of theitraverse B on surface 23. If, for instance, the velocity of the primary traverse on roller 7 is constant, then the corresponding velocity of the secondary traverse on surface 23 is also constant. According to the invention, it is possible in a simple manner to alter the variation ofthe velocity of the secondary traverse in a simple manner to provide a functional dependence on the primary velocity. As shown in FIG. 4, deflector element 16' has a yarn-guiding surface which is curved in the longitudinal direction. The guiding edge 31 of deflector 16, which can replace element 16, is sinusoidal, whereby for a constant velocity of the primary traverse there is obtained a sinusoidal variation of the velocity of the secondary traverse on the plate. With the aid of other curved shapes of the deflector element, it is possible to achieve arbitrary velocity variations for the secondary traverse.

FIG. 5 shows a modified form 16" of the deflector element, also in the form of a round pin, which differs from element 16 in that it is inclined so as to cause its axis 27 to form together with the lines 28, 29 defined by the traverses A and B in plan view a triangle, the hypotenuse of which is formed by axis 27' of deflector element 16". If in this arrangement the yarn is in the extreme right position on roller 7 closest to surface 23, then the yarn on surface 23 will be in the position a which is most remote from roller 7. On the other hand, when the yarn is in the position on roller 7 which is most remote from surface 23 corresponding to the extreme left-hand position b, then the yarn on the heating surface Wlll be in the position b which lS closest to roller 7. In this embodiment, the yarn encircles the deflector element in the opposite direction relative to the embodiment of FIGS. 1, 2, 3. The FIG. 5 embodiment has, among other things, the advantage that the length of yarn which is in the stretch field is at least substantially independent of the traverse position of the yarn at any particular moment, as is immediately apparent from FIG. 5.

In the FIG. 5 embodiment also, the axes of roller 7 and element 16 may preferably be disposed in mutually parallel planes, which are also parallel to that of FIG. 5,

by: is claimed is: comprising:

1. Arrangement for providing traverse movements of a yarn in a pair of substantially perpendicular directions in a field of operation of a textile machine, comprising a first guide element for inserting the yarn in said field, and

a second guide element spaced relative to said first guide element,

characterized by an oscillating yarn guide means for traversing said yarn on said first guide element, a deflector element between said first and said second guide elements having an elongated yarn-guiding surface in an inclined position relative to said first and second guide elements, whereby the traverse of said yarn along said first guide element is transformed, first, into a traverse thereof on said deflector element and, secondly, into a traverse on said second guide element.

2. Arrangement according to claim 1, in which said yarnguiding surface is stationary.

3. Arrangement according to claim 1, in which the longitudinal extension of said yarnguiding surface is inclined at an angle of 30 to 60 relative to the traverse movement on said first guide element.

4. Arrangement according to claim 3, in which said angle is substantially 45.

5. Arrangement according to claim 1, in which said yarnguiding surface is rectilinear.

6. Arrangement according to claim 1, in which said yarnguiding surface is curved in the longitudinal extension thereof.

7. Arrangement according to claim 1, in which said deflector element is adjustable in position. 

1. Arrangement for providing traverse movements of a yarn in a pair of substantially perpendicular directions in a field of operation of a textile machine, comprising: a first guide element for inserting the yarn in said field, and a second guide element spaced relative to said first guide element, characterized by: an oscillating yarn guide means for traversing said yarn on said first guide element, a deflector element between said first and said second guide elements having an elongated yarn-guiding surface in an inclined position relative to said first and second guide elements, whereby the traverse of said yarn along said first guide element is transformed, first, into a traverse thereof on said deflector element and, secondly, into a traverse on said second guide element.
 2. Arrangement according to claim 1, in which said yarn-guiding surface is stationary.
 3. Arrangement according to claim 1, in which the longitudinal extension of said yarn-guiding surface is inclined at an angle of 30* to 60* relative to the traverse movement on said first guide element.
 4. Arrangement according to claim 3, in which said angle is substantially 45* .
 5. Arrangement according to claim 1, in which said yarn-guiding surface is rectilinear.
 6. Arrangement according to claim 1, in which said yarn-guiding surface is curved in the longitudinal extension thereof.
 7. Arrangement according to claim 1, in which said deflector element is adjustable in position. 